Tractor



1,559,617 E. A. JOHNSTON TRACTOR Filed Dec. 24, 1921 B shets-sheet 1Nov. 3, 1925.

Nov. 3, 1925 E. A. JOHNSTON TRACTOR Ime? 7.

E' OJQ Nov. 3, 1925.

E. A. JQHNsToN TRACTOR Novo 3, E. A. JOHNSTON TRAC TOR Filed Dec. 24,1921 8 Sheets-Sheet 4 Nov. 3, 1925. 1,559,617

' E. A. JOHNSTON TRAC TOR Filed DeO. 24 1921 8 Sheets-Sheet 5 Nov.3,1925. 1,559,617

E. A. JOHNSTON v TRACTOR Filed Deo. 24, 1921 8 Sheets-Sheet '7 l f Y- Cf f Lamm/ ,i2/a@ iul,

E. A. JOHNSTON TRACTOR Nav, 3,1925'. 1,559,617

`Filed Deo. 24, 1921 8 Sheets-Sheet 8 Patented Nov. 3, 1925..

EDWARD A. JOHNSTON,

or CHICAGO, ILLINOIS, AssIeNo'n To INTEBNATIONL nan.-

VESTEB COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

TRACTOR.A

Application tiled December 24, 1921. Serial N0. 524,570.

To all whom t may concern:

Be it known that I, EDWARD A. JOHNSTON,

a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented certain new and usefulImprovements in Tractors, of which the followlng is a full, clear, andexact speci lication.

My invention relates to an improved tractor of the type generally usedfor agricultural purposes. Tractors as usually designed have a framemade up from several parts, usually structural shapes, bolted 0r rivetedtogether. This frame is supported on the driving and supporting wheelsand carries the operating and driving parts of the tractor bolted orotherwise secured thereto in operative relation. The frame of thetractor is subjected to Stresses and strains ot' great magnitude intraveling over rough and uneven ground, which soon loosens the jointsand throws the operating parts such as gears, shafts, bearings, etc. outof alignment. This results in noisy operation of the tractor and causesexcessive wear and breakage of parts, with its attendant high operatingcost and upkeep. It very frequently becomes necessar to re lace worn outor broken parts an to a just others, which is usually a considerabletask, since the machine as a Whole is so assembled that it must bedismantled in order to make an adjustment or replace a part.

It is therefore an object of my invention to provide a tractor having arigid frame preferably formed in a single piece that will not bedistorted in operation, but will maintain all the operating parts inproper operative relation, the frame being so supported that thestresses and strains therein will be reduced to a minimum.

Another object is to provide a tractor in which all the operating artsare readily accessible for necessary justments or replacements.

Another object is to provide a tractor o1' other motor vehicle in whichthe operating parts are 4assembled in distinct units which are capableof removal from and assembly in the tractor as units and withoutdisturbing the adjustment of other parts or units.

Still another object is to provide a tractor of pleasing appearance yetlsturdy and strong, and having relatively few operatmg parts.

Yet another object is to provide a tractor 1n which all the operatingparts are completely housed, thereby enabling the parts to be mostefficiently lubricated and protected from dust and dirt.

Another object of my invention is to proyide atractor having a powerdrive for an lmplement, the power drive shaft being associated with-thetransmission so that the implement may be driven only when the tractoris being driven at first and second speeds, thereby preventing injury tothe implement from its being driven at excessive speed or in a reversedirection. I Another object is to provide a lubricat- Ing means for a'tractor in which all the operating parts may be lubricated from a singlelubricant reservoir, thereby greatly decreaslng the attention requiredfrom the operator and assuring a proper supply of lubricant toall theworking parts at all times.

'lhe above and other objects are attained by the embodiment of myinvention illustrated in the accompanying drawing, in which,-

Fig. 1 is a side elevation of my improvedtractor.

Fig. 2 is a side elevation with the main frame `partly broken away toshow the transmission and clutch assemblies.

Fig. 3 is a longitudinal section substantially on the line 3-3 of Fig. 5showing the transmission and clutch assemblies, certain part-s beingomitted to avoid needless complication of the drawings. f 7

Fig. 4 is a plan view of Fig. 2' with the cover plates removed andcertain other parts omitted.

Fig. 5 is a transverse sectional'fview on the line 5-5 of Fig. 2 lookinginthe direction of the arrows.

Fig. 6 is a section of the transmission taken substantially on the line6--6' of Fig. 5.

Fig. 7 is a section of the transmission taken substantially on the line7-7 of Fig. 6. l

Fig. 8 is a plan of the main frame.

' the tractor.

Fi 9 and 10 are a side elevation of the gli? end and a front elevationrespectively: of the main frame.

Fig. 11 is a detail of the belt pulley assemb y partly in section andpartl'l broken away to show the mounting of e shaft and means forlubricating t e bearmgs.

Fig. 12 is a vertical section through the rear axle and differential.

Fi 13 is a detail taken substantially on the hne 13-13 of Fig. 4 showingthe means for supplying lubricant to the belt pulley driving gears.

Fig. 14 is a vertical section on the hne 14-14 of Fig. 4 showingthebrake assem- Fig. 15 shows the manner of mounting the steering assemblyon the transmission Figflis a plan view of the cover for the rear end ofthe main frame.

My improved structure comprises a main frame 20, preferably formed as anintegral casting su ported at its front end by the steering w eels 21and at its rear end by the traction wheels 22.

Referring to Figures 1, 2 and 4, there are mounted on the frame fromfront to rear, a radiator 23, an engine'24 covered by the' hood 25, aclutch mechanism 26, a belt pulley driving assembly 27, a transmission28, an intermediate driving shaft or brake shaft 29, and a bull gearcarrying the differential and driving the rear axle of The radiator,hood and engine may be of any suitable construction and per se form nopart of the present invention, they being shown merely to complete theillustration. It will be noted from an inspection of the drawing thatthe clutch, belt pulley drive, and the differential are all assembled indistinct units and are assembled in the tractor or removed therefrom asa whole.

It will also be noted that the shaft 29 and the ears carried thereby;the rear axle, toget er with the gear 30, and the differential mechanismmounted therein; and the steering assembly to be described later, alsoconstitute separate units that may be. as-

' sembled or removed from the tractor Without disturbing other parts.These unit assemblies, together with the main frame and y lubricatingsystem form the principal parts of my invention.

In the detail description of my tractor which now follows, I willdescribe. the unit assemblies separately and statethe relation that eachbears to the others.

Clutch mechanism.

Referring to Figures 2, 3 and 4, the engine is supported at its rear endby a flywheel housing 31 secured to opposite sides of the frame. Withinthis housing is the il '-wheel 32 which carries one set of disks o amultiple disk clutch formin part of the clutch mechanism above reerred-to.

The other set of disks is carried by a' main' clutch spider 34 securedto or formed inteal with a sleeve 35 splined to one end of the shaft 36and held in position by the pin or bolt 36. The opposite end of theshaft 36 has a head 37 which forms one element of a clutch for drivingthe transmission spline shaft 38 and is adapted` for engagement by theclutch brake 39 to stop rotation of the shaft when the main clutch isdisengaged. A clutch shifter spider 40 is engage by the coil springs 41,of which there are preferably 3, secured by studs which are adjustablein the ends of bolts or pins 42 fastened to the flywheel, the springs 4lnormally holding the clutch disks in engagement. The shifter spider isbored centrally to receive a flanged shifter tube 43 surrounding theshaft and'secured to the spider by a split collar 44. The other end ofthe shifter tube is screw-threaded to receive a nut 45 for securing theclutch shifter collar 46 thereon, the collar being mounted on a ballbearing as shown and engaged by the shifter fork 47. The clutch brake 39is secured to the collar 46 and when the clutch is disengaged the brakecontacts with the head 37 to check the speed of the shaft. The fork 47is secured to a shaft 48.mounted in the main frame and extends at oneend beyond the frame where a lever 49 is keyed thereon (see Fig. l) Alink 50 is pivotally connected at one end to the lever 49 and at itsother end to the clutch pedal 51 which is pivoted 'intermediate its endsto a bearing cage mounted in the main frame near its rear end, as willbe described later.

When it is desired to repair the clutch mechanism or replace a wornpart, the entire mechanism may be removed as a unit, the repair effectedand the clutch replaced Without dismantling the entire structure, aswill now be described.

AThe belt pulley drive aselnbly is first removed from the frame, whichgives access to the clutch mechanism from above. The shifter fork 47 isthen disconnected from the collar 46. The split collar 44 is removedfrom the tube, the pin 36 driven out, and the springs, studs and locknuts removed from the pins 42. This releases the entire clutchmechanism. The shaft 36 is now telescoped into the sleeve 35 until theclutch 37 is disengaged. The spider 40 is telescoped over the tube 43until it clears the ends of the pins 42 and the spider 34. together withthe sleeve 35 slid to the left, Fig. 3, as far as possible. The clutchmechanism Will then have been shortened by this telescoping of the partsso that it may be lifted out through the opening provided by removingthe assembly 27. After the necesllO lli.

' sary repairs or adjustments have been made the clutch -is reassembledin the tractor by reversing the above operations.

Transmission mechanism.

The transmission mechanism is assembled in a cage so that it can beinserted in or removed from the tractor without changing the adjustmentsofother parts.

Referring to Figures 3 to 7, the transmission cage 53 has two laterallyextending fianges 54, 55 secured to the main frame and supporting thecage thereon. In order to accurately center the cage each flange isbored to closely fit a dowel 56-57 secured in the frame. The drivingshaft 38 is journaled in the cage and has three gears 58, 59, 60 splinedthereon, the gears 59 and 60 preferably being'formed in a single piece.The gears 58, 59 and 60 cooperate with gears 61, 62 and 63 lrespectivelykeyed to a driven shaft 64 journaled in the cage and carrying a bevelgear 65 for driving an intermediate shaft presently to be described.

A reverse drive shaft 66 is xedly mounted in the cage and carries arotatable sleeve on which two spur gears 67 68 are secured. The gear 68meshes with gear 62 and gear 67 is adapted to mesh with gear 58 when thelatter is shifted to reverse drive position on the shaft 38. The gear 58is also adapted to cooperate with an idler gear 69 rotatably mounted onthe shaft 64 and with a gear 70 rotatably mounted on a power take ofi"shaft 71 journaled in the upper p'art of the cage.

The power take off shaft is splined near its central ortion to slidablyreceive a clutch element 2 adapted to engage a corresponding clutchelement formed on the gear 70. At one end the shaft has a bevel gear 73for driving the belt pulley and at its opposite end is connected by ascrew-threaded sleeve 74 to an implement drive shaft `7 5.

The gears 58, 59 and 60 are shifted by the gear shift lever 76 mountedin a ball and socket joint partly formed inl a cover plate 77. The gearshifter rods 78, 79 are slidably mounted in the cage on op )osito sidesof the guide 80 and are adapte` to be engaged by the lower end of theshifter lever, as 1s usual in the art. The rod 78 carries a shifter fork81 engaging in a groove in the gear 58, while the rod 79 has a fork 82for shifting the gears 59, 60. The rod 78 is provided with three notches83, Fig. 6. adapted to be engaged by a spring pressed detent 84 to v'ieldably hold the rod in each of its three positions. The rod 79 issimilarly provided with notches and a cooperating detent which do notshow in Fig. 6, being directly-behindthose just described. Thetransmission cage 53 is open on its top side, the opening being normallyclosed by a cover 85 having a bearing for a short shaft 86. A clutchlever 87 is fixed to one end of the shaft exteriorly of the cover while.the lever '88 carried by the other end extends ldownwardly into thecage and at its lower end enga es a shifter fork 89 rigidly clamped tothe s ifter rod 90 and enga ing in a groove in the clutch element 72. herod 90 is slidably mounted in the cage and has two notches adapted to beengaged by the spring pressed detent 91 to yieldably hold the c utch ineither engaged or disengaged position.

Assummg now that the engine has been startedv andthe transmission gearsare iny neutral osition as shown in Figures 3, 6 and 7. he lever 76 willbe moved to shift gear 60 into mesh with gear 63 which will start thetractor atlow or first speed. Gears 60, 63 are then disengaged and gear59 meshed with gear 62 to drive the tractor at intermediate or secondspeed. 'lf it. now be desired to drive the tractor at third or highspeed, gears 59-62 are disengaged and gear 58 shifted into mesh withgear 61. For reverse drive the gears 59-6O are in neutral position,while gear 58 is shifted into engagement with reverse gear 67 (Figures 6and 7), the drive then being through gears 58, 67 and gears 68, 62 tothe shaft 64. It is to be noted that when the tractor is at rest or isbeing driven at first. or second speeds, the gear 58 will be in meshwith gear 7() on the power take off shaft and with the idler 69 so thatthe power take off shaft and the belt pulley and implement drive shaftconnected thereto may be driven by proper manipulation of the clutch 72,but when the tractor is being driven at high speed or in reverse thegear. 7 0 is inoperative and the implement drive shaft and belt pulleycannot be driven. This operates as a safety device to prevent reverse orhigh speed operation of the implement or machine being driven by thetractor. The function of the idler 69 is to carry lubricant from the oilreservoir in the bottom of the frame upward to the gears 58, 70, as willpresently appear in the description of the lubricating system. The cage53 and the mechanism mounted therein are removable as a unit from thetractor, as will now be described.

To remove the transmission mechanism the cover 77 will rst be removed.carrying the shifter lever 76 therewith. The sleeve 74 and shaft 75 arenext disengaged and the belt pulley assembly 27 removed. The boltsholding the cage 1n position are then removed. Whereupon the cage andentire transmission mechanism may be lifted out. In thus removing thetransmission the clutch element formed on the end of the shaft 38 slidesout of engagement with the clutch 37, as will be apparent. When thenecessary repairs or adjustments have been made the transmission isagain assembled in the tractor, being accurately located by positions.

Belt pulley :d1-ive.

The belt pulley drive, as shown in Figures 3, 4, 11 and 13, comprises acasing 96 bolted to the main frame and to the transmission cage.- Thecasing is open at the top and is divided 'interiorly by partition 97 yinto front and rear compartments 98, 99, the front compartment beingopen and joining the bell y opening 105 in the rear wall registeringwith a similar opening in the transmission cage. Oil thrown from thegear 70 against the side of the transmission cage collects in a trough106 from whence it fiows through the opening 105 into the compartment99; The oil level in the compartment is maintained const-antly at thelevel of the top of the trough, any excess oil overflowing the troughand .dropping down over the transmission gears to the bottom of the mainframe. A-re movable cover'107 closing the opening in the to of thecasing provides access to the gears 3, 104 without removing the assemblyfrom the tractor and also serves as a means for introducing lubricant inan emergency.

Brake shaft assembly and reef/'Aarle drive.

Referring to Figures 4 and 14, the bevel pinion meshes with a bevel gear108 keyed on the intermediate or brake drum shaft 109 journaled inbearings supported by a pair of cages 110, 111 mounted in aperturesbored in opposite sides of the main frame. The cage 110 is bored at 110to receive a pin for supporting the brake pedal 51 previously described.The shaft extends through the cage 111 and at its outer end carries thebrake drum 112. 113 surrounds the drum and cooperates with the brakelever 114 mounted on the stud 115 secured in the side of the lnainframe. A pinion 116 keyed to the shaft 109 adjacent bevel gear 108meshes with and drives the gear 30 which carries the differentialmechanisin and drives the rear axle, as best shown iu Figure 12. 'Ihegear 30 is secured to the differential drum 117, which has oppositelyextending hollow trunnions supported in the rear axle carriers 118, 119secured in opposite side walls of the main A brake band aaneen usualdifferential pinions meshing with' bevel gearsv mounted on the innerends of the shafts or axles 120, 121, the axles extending through thecarriers and being supported in bearings near their outer ends wherethey are keyed to thetraction wheels. A pair ot' lugs 122, 123 dependingfrom each Aof the carriers provides a means for attachi-ng a draw barorother appliance to the tractor by means of pins 124, 125.

Steering assembly.

\.\In Figures 1 and 15 I have shown the steering assembly which formsone unit of the tractor and is preferably -mounted on the transmissioncage. The assembly comprises a casing 126secured by three bolts engagingin tapped holes 127 in the transmission cage,

Figures 4 and 15. A steering -post 128 mounted on the casing carries ahand wheel secured to the upper end of a steerin shaft 129, the lowerend of which exten s into the casing for actuating the usual worm andwheel, the wheel being secured to vone end of a shaft 130 journaled inthe casing. An arm 131 fixed to the outer end of the shaft 130 isconnected by a link 132 to the steering knuckles of the front wheels 21.Intermediate its ends the post 128 is provided with a lug or bracket 133drilled to' receive and support the lconcentric spark and throttlecontrol rods 134.

M afl/n frame.

The main frame 20 (Figures 1', 8, 9 and 10) is preferably cast in asingle piece, but may be a sheet metal stamping or be formed by rigidlysecuring two or more pieces together. At its front end the frame isrelatively wide and shallow, while at its rear end it is relativelynarrow and deep, the depth increasing uniformly from front to rear, andthe width changing about midway of the two ends. The frame has a twopoint support at its rear end von the rear axle carriers 118, 119 whilethe front end is supported at a single point by the bolster 136 which isbolted to the frame and pivotally connected to the front axle 137. Thisprovides a three-point suspension for the frame and minimizes stressesand strains when the tractor is being operated over rough ground.

I will now point out how the several parts or units previously describedare supported .on the unit frame.'

Referring to Figure 8, the frame at its forward end has two oppositebosses 138 drilled and tapped to receive bolts for securing the radiator23 rigidly to the frame. Next in the rear of the bosses 138 are twobosses 139 tapped to receive bolts for securing the front bracket of theengine 24 to the frame, the rear end of the engine being the dowels 56,57, and the cover late 77 and frame. The differential casing carries theAbelt pulley assembly secured in t eir proper supported by the ywheelbell housingv 31 which is secured by bolts engaging in the tapped holes140, 141. The belt pulley casting is secured adjacent the bell housingby bolts screwed into openings 142 in the frame and is also secured tothe transmission cage by bolts 143 (Fig. 2). The frame is next providedon one side with three tapped holes 144 and on the opposite side Withtwoholes 145 to receive bolts for securing the transmission cage inposition. Between the two sets of tapped holes are drilled holes 146,147 for the reception of the dowels 56, 57 for accurately locating thecage with respect to the frame and cooperating operative parts of thetractor. The rear part of the frame has a plurality of tapped holes 148(ten in number) for securing a cover 149 over the mechamsm housedtherein. The cover 149 is best shown in Figs. 2, 12 and 16 and at itsforward end has a raised portion 150 in which is formed a semi-sphericalrecess 151 forming one half of a bearing for the ball of the gear shiftlever 76, the other half of the bearing being provided in the plate 77which closes the raised ortion 150. The cover has a centrally raiseportion. 152 embracing the gear 30 and wide enough to permit passage ofthe implement drive shaft 75 which extends rearwardly through the coverand is supported at its rear end in a bearing in a cylindrical sleeve153 formed integral with the cover and closed at its rear end by aremvable cap 154. The implement drive shaft terminates within the capwhich serves to exclude dust and dirt from the interior of the tractorwhen an implement is not bein driven from the shaft. At its forward` endthe cover has vertical flanges. 155 for bolting it to the rear of thetransmission cage and laterally extending Aarms or flanges 156 adaptedto support the front ends of ards or fenders for the traction wheels, te rear ends of the guards bein supported from shoulders 157, 157 "formeintegral with the rear axle cages 118, 119 (Figures 4 and 12). Theguards for the rear wheels are not shown in the drawings, since they areof usual construction and their v illustration would only tend toconfusion by lcomplicating the drawings. Near the right hand side of thecover are a pair of holes 158 adapted to receive bolts to support theoperators seat 158 shown in Fig. 1. The front end of the frameV has alar e opening 159 through which access may e had to the oil pan 160 ofthe engine (Figures 2 and 8). A stay rod socket 161 is secured to theframe adjacent the rear edge of the opening 159, as shown in Figure 1.

Referring now to Figures 2, 3 and 8, the .frame-is divided by a vertical.partition162 into front and rear parts, the rear part being completelyclosed by the transmission cage and rear cover and providing a reservoirfor a lubricantl in which the operative parts run. A dam 163 separatesthe reservoir into front and rear compartments and serves to maintainlubricant in the front compartment at the proper level for thetransmission gears 62, 61., 69, while sufficient lubricant is maintainedin the rear compartment to lubricate gears 63, 108, and 30. Each of thecompartments is provided with a drain opening 164,

`\ 165 normally closed b y plugs or drain cocks for draining out thelubricant when desired. A bridge or brace 166 is provided directly overthe brake shaft to strengthen the frame and reinforce the sides whichare somewhat weakened by the lar e apertures provided for the receptionof the bearing cages. Lubricating oil thrownfrom the gears 63, and 68against the side of the .frame is caught by a trough 167 (Figures 5 and8) sloping toward and terminating at thev top of the dam 163 over which.the oil will flow into the front compartment to maintain the oil at theproper level therein.

Lubricating system.

The construction of the main frame and the arrangement of the partshoused therein affords a very convenient and eficient means `forlubricating the operative mechanism of the tractor, as will now bedescribed.

The cover 85 of the transmission cage (Fig. 2) has an oil fillingopening 168 through which oil is poured, 1t running over thetransmission gears and filling the front compartment to the height ofthe dam 163, which it then overflows until the oil reaches the properlevel in the rear compartment as indicated by a gauge of usualconstruction attached to the rear end of the frame, but

not shown. lVhen the proper amount of oil l has been poured into theframe, the opening 168 is closed. If the tractor is now started the sixgears 30, 108, 63, 62, 61 and 69, will all be running in oil. A mist ofoil maintained by the gears 63, 62, 61 and`69 will thoroughly lubricateall the transmission gears and bearings and oil carried to the gear 70by means of the gears 69 and 58 will be thrown against the side of thetransmission cage and caught by the trough 106 (Fig. 13) from whence itwill run through the opening` 105 to maintain oil in the chamber 99 tolubricate the gears 73, 104, and the bearings of the shaft 101. Excessoil from the transmission gears and trough 106 will drain back to thebottom of the frame to be again distributed. The gears 30, 108 and 63maintain a mist of oil in the rear chamber which thoroughly lubricatesall the gears and bearings, oil dripping through apertures 169, 170 inthe carriers 118, 119 (Fig. 12) to lubricate the rear axle bearings. Oilflung from the gears 63, 65 against the wall of the frame is caught bythe trough 167 and flows into the front chamber, any excess-oil thereinrunning over the dam back into the roar lchamber. It will thus beapparent that avery efficient means for lubricating the gears andbearings is provided, since it will require attention only at veryinfrequent intervals and all the parts are lubricated by oil supplied ata single point.

While I have described one embodiment of my invention in considerabledetail and have identified the parts by specific terms, it is to beunderstood that I do not desire to be limited to exact details shown anddescribed, but that my invention embraces all modifications andrearrangements of parts that may fall within the scope of my claims orbe the equivalents of the invention defined thereby.

What I claim as new and desire to secure by Letters Patent is:

1. In a tractor, a main frame having a broad and shallow front part, arelatively narrow and deep rear part, a wall separating the two partswhereby a reservoir for lubricant is provided in the rear part, atransmission assembly closing the reservoir adjacent the partition andextending thereinto, differential gearing mounted in the reservoir atthe opposite end, a removable cover closing the reservoir over thedifferential gearing, and driving connections in the reservoir betweenthe transmission and differential.

2. In a tractor, a main frame having a relatively broad and shallowfront part, a relatively narrow and deep rear part, a wall separating,-the two parts whereby a reservoir for lubricant is provided in the rearpart, a transverse' dam dividing the reservoir into front and rearcompartments, a transmission assembly closing the iront compartment andextending below the top of the dam, differential gearing mounted in therear compartment, a removable cover for the differential gearing, anddriving connections between the transmission and differential. v

3. In a tractor, a single piece main frame having a transverse partitiondividing the frame into front andfrear parts; a radiator and an enginemounted on the front part; a transmission, a. differential, and atransverse shaft housed in the rear part; driving connections betweenthe transmission, transverse shaft, and.- differential', and meansextending through the partition for driving the transmission from theengine.

4. In a tractor. a main frame formed from `a single piece of metalhaving a partition dividing it into an open frontpart and a rearcompartment and increasing in depth from the front to the rear, thefront part being of substantially uniform width and wider than the rearpart, radiator and engine supports on the front part, supports for atransmission in the compartment adjacent the partition, and a luralityof vtransverse bearing supports in t 1e compartment in the rear of thetransmission supports. A A

5. In a tractor having a main frame, a removable assembly comprising acasing adapted to be bolted to the frame, a partition dividing thecasing into two compartments, a hollow arm extending laterally from onecompartment, a shaft journaled in the arm and compartment and extendingbeyond the arm, a gear on the shaft in the compartment, and a beltpulley on the extended end of the shaft.

6. In a tractor having a main frame, a removable assembly comprising acasing having a chamber holding lubricant therein, the casing beingadapted to be secured to the frame and having an aperture in one sidewall opening into the lubricant chamber for supplying lubricant thereto,a shaft journaled in the casing and extending through the chamber andbeyond the ycasingat one end, a gear on the shaft in the chamber, and abelt pulley on the extended end of the shaft.

7 In a tractor, the combination of steering wheels and driving wheels, amain frame formed from a single piece of metal, 9

means for supporting the front end of the frame on the steering wheels,a driving shaft extending thru the rear end of the frame and supportingthe frame on the driving wheels, a differential secured to the drivingshaft within the frame, a second shaft journalled in the frame anddriving. the differential, one end of the said shaft extending laterallythrough the frame and provided at said end with means whereby a brakingaction may be exerted thereon, a transmission housed within the frameand driving the second shaft, a transverse partition providing with therear end of the frame a reservoir for lubricant, andv lan engine mountedon the front end of the frame for driving the transmission.

8. In a tractor, the combination with a unit frame having a transversepartition providing with the rear end of the frame a reservoir forlubricant, of an axle extending thru the reservoir and supporting therear end of the frame, a differential mounted on the axle within thereservoir, a brake shaft extending transversely of the reservoir andjournalled in the side walls of the frame and having one end protrudingthrough the casing and carrying means for exerting a braking actionthereon, driving connection between the shaft and differential, one endof a transmission mounted on the frame and extending into the reservoir,driving connections between the transmission and brake shaft, an enginemounted v driving connect-ions between the engine and transmission. f 4

9. In a tractor having a umt frame, the

combination of a cage carrying transmission 10. In a tractor,l aremovable unit as' sembly comprising a cage having supporting flanges, adriving shaft and a driven shaft journalled in the cage below theflanges, cooperating change speed gears on the shafts,a driving. elementony the driving shaft, a driving gear on-the driven shaft, a powertake-off shaft .in the cage above the flanges, means for driving thepower takeoff shaft from the driving shaft, and means in the cage forshifting the change speed gears.

411. In a tractor, the combination of a unit frame, a cage carrying atransmission removably mounted on the frame, a belt pulley drlvelassembly mounted on the frame adjacent the transmission, a power takeoffshaft journalled in the cage, means for driving the power takeoff shaftfrom the transmission, and means for driving the belt pulley from thepower take-oft' shaft.

12. In a tractor, the combination of a main frame providing a reservoirfor lubricant, a removable cage mounted on the frame and carrying atransmission mechanism projecting into the lubricant reservoir, a powertake-off shaft journalled in the cage and driven from the transmission,a belt pulleyshaft journalled in a casing removably mounted on theframe, means for driving the pulley shaft from the power take-off shaft,and an implement drive shaft driven from the power take off shaft. 13.In a tractor, the combination of a main frame providing a reservoir forlubricant, a removable cage mounted on the frame and carrying atransmission mechanism projecting into the lubricant reservoir, a powertake off shaft journaled in the cage and driven from the transmission,

` means cooperating with the transmission to convey lubricant from thereservoir to the power take oft shaft bearings, a belt pulley shaftliournaled in a casing removably mounted on the frame, means for drivingV cant, a removable cage mounted on the frame, a driving shaft.journaled in the cage, a plurality ofi gears slidable on the shaft androtating therewith, a driven shaft 'ournaled in the cage and having aplurality vof gears extending' into the reservoir, a reverse kdriveshaft mounted in the cage and having a pair of gears thereon, meansslidable in the cage for shiftng the gears on the drivinvP shaft sotasto drive the driven shaft at three Speeds 'forward and one reverse, apower take off shaft, and

means for driving the powertake ofi' shaft only when the driven shaft isat rest or rotating at first or second speed.

15. In a tractor, the combination of a main frame providing a reservoirfor lubricant, a. removable cage mounted` on the Iframe, a driving'shaftjournaled in the cage and having a plurality of gears splned thereon, adriven shaft journaled in the cage, a plurality of gears fixed thereonand extending into the lubricant reservoir, a reverse drive shaftmounted in the cage and supporting a pair of gears, means for shiftingthe gears on the driving shaft to drive the driven shaft at three speedsforward and one reverse, a power take off shaft journaled in thel cageabove the driving shaft, and means for preventing operation of the powertake off shaft when the driven shaft is driven at high speed or reverse.

. 16. In a tractor, the combination of a main frame providing areservoir for lubricant, a removable cagev mounted on the frame, adriving shaft journaled in the cage and having a plurality of gearssplined thereon, a driven shaft journaled in thecage, a plurality ofgears fixed thereon and extending into the lubricant reservoir, a

reverse drive shaft fixed in the cage and having a pair of gearsjournaled thereon, means for shifting the gears on the driving shaft todrive the driven shaft at three speeds forward and one reverse, a powertake off shaft journaled in the cage above the driving shaft, means forprevent-ing operation of the power take off shaft when the driven shaftis driven at high speed or reverse, and means for conveying lubricantfrom the reservoir to the bearings of the power take off shaft.

17. In a tractor, thel combination of a frame, a transmission casingsupported on a frame, a driving shaft journalled in the casing, aplurality of gears slidable on the shaft and rotatable therewith, adriven shaft journalled in the casing and having a plurality of gears, areverse drive shaft mounted in the casing and having a pair of gearsthereon, means slidable in the casing for shifting'the gears onl thedriving shaft so as to drive the driven shaft at a plurality of speedsforward and one reverse, a power take-off shaft, and means for drivingthe power take-off shaft only when the driven shaft is at rest orrotating at the lower speeds forward. l

18. In a tractor, a single piece main frame of increasing depth fromfront to rear divided by a partition into a relatively shallow openfront end' and a relatively deep open topped reservoir .at the rear end,a. radiator, an engine, .and a clutch mechanism mounted on the frontendl of the frame, a transmission and a difterential mounted within thereservoir, and means for closing the open top of the reservoir. l'

19. In a device of the class described, the combfnation of a main frame,a partition dividing the frame into front and rear parts, the rear partproviding a reservoir for lubricant. a dam dividing the reservoir intofront and rearl compartments, gearing operating in the rear compartment,vmeans cooperating with, the gearlng to supply lubricant from therearcompartment to the front compartment, gearing in the frontcompartment, a casing mounted on thev frame above the front compartment,mechanism inthe casing driven from the gearing in the front compartment,and means cooperating with the gearing for supplying lubricant to thecasing.

20. In a tractor, the combination of a main frame, a lubricant reservoirformed in the frame, adam dividing the reservoir into front and rearcompartments, gearing including a differential mounted in the rearcompartment, an inclined trough formed on the frame and directinglubricant thrown from the gearing into the front compartment, a cagelnonnted on the4 frame and carrying transmission mechanism ope 'ating inthe front compartnient, a casing mounted -on the frame adjacent thecage, gearing operating in the casing, and an inclined trough on thecage receiving lubricant from the transmisson gears and discharging intothe casing.

2l. In a tractor, the combination of a l' to the top of the frame, atransverse Shaft y `jou'rnalled in the'casing and having a steering armat one end, a steering shaft supported on the` casing, means for turningthe transverse shaft from the steering shaft, and means operativelyconnecting the arm and steering wheels. v

In testimony whereof I alx my signature.

EDWARD A. JOHNSTON.

